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GEORGE HIPWELL, OF DES MOINES,

HIS RIGHT TO MASON & (10., OF SAME PLACE.

PATENT OFFICE.

IOWA, ASSIGNOR OF ONE-HALF OF BLANK FOR STOVE-Pl PES.

r SPECIFICATION forming part Of Letters Patent NO. 229,532, dated July 6, .1880.

Application filed December 19, 1879.

To all whom it may concern:

Be it known that I, GEORGE HIPWELL, of Des Moines, in the county of Polk and State of Iowa, have invented an Improved Stove- Pipe, of which the following is a specification.

My invention relates to that class of improvements in stove-pipes that contemplate the nesting of pieces to economize space and expense in packing and shipping.

Heretofore two longitudinal sections of a pipe have had grooves and beads formed on their edges in such a manner that they could be connected by sliding them together lengthwise to form a complete piece of pipe. A stove-pipe blank has also been formed by bond in g one of its longitudinal edges into Z shape, so as to allow its opposite and straight edge to slide laterally into the open groove of the Z-shaped edge, to be then fastened therein by means of rivets or pins.

The two longitudinal edges of a stove-pipe blank have also been doubled backward to form two uniform grooves adapted to receive the flanges of a sliding interlocking strip, to connect the mating edges of the pipe-blank and to produce a re-enforced longitudinal scam in the complete pieceof pipe.

My improvement consists in forming a tube on one of the longitudinal edges of a stovepipe blank in such a manner that its opposite and mating edge, formed in a common way, can be readily slipped into the tubular edge to connect the two edges and to produce a neat, strong, and durable seam, as hereinafter fully set forth.

Figure 10f my drawings represents a transverse section of a stove-pipe blank formed in a common way by bending its longitudinal edges or a backward in opposite directions and the one inward and the other outward in such a manner that they will readily hook to- Fig. 2 represents a transverse section of my improved stove-pipe blank, in which 1 form a second bend and shoulder, 11, to raise the doubled portion of the edge a, and to thereby practically produce a tubular edge that has an opening extending along its inner side, and the shoulder b, adapted to admit the reverselybent edge a into the tubular edge a b, as illustrated by Fig. 3. Fig. 4 is a perspective view, showing my tubular edge a b and the common edge a, formed on a flat blank. Fig. 5

is a perspective view, showing the flat blank after it has been passed through a formingmachine. Fig. 6 represents a section of a complete piece of my improved pipe, in which the edge a has been inclosed in the tubular edge a b and the folded portions of the two interlocking edges pressed flat and together to produce a neat, strong, and durable seam.

I am aware that in the common way of making stove-pipe, when the edges are doubled backward upon the body of the blank in reverse ways, as illustrated by Fig. 1, the edges are interlocked and then pressed together by means of a former that produces a shoulder similar to the bend b of my blank and a seam that is practically the same in structure as is the seam produced by means of my improved blank; but in closing the seam and forming the shoulder by means of a former and successive blows of a mallet, greater expenditure of time and labor is required than by my method of forming a shoulder and tubular edge in the blank before the edges are interlocked, and then simply pressing the doubled and interlocked edges together; and by forming the shoulder in the blank by means of an attachment that I apply to a stove-pipe brake I produce the bend and shoulder b by one motion, and make it uniform and smooth its entire length, whereas a shoulder that is made by successive motions and a former, as required in closing a seam in the common way, is irregular, and consequently the seam in the complete pipe will not be as neat, strong, and durable as a seam produced by means of my method and my improved blank.

In addition to these advantages, my improved blanks are adapted to be nested and 0 packed and shipped in compact packages from the factory .to any place where they can be sold, and no former or skilled labor is then re quired to interlock the edges and make a com plete seam and pipe, because all that is neces- 5 sary is to slip the edge a into the tubular edge a b and then press the doubled portions together flat between two plain surfaces.

1 claim- The improved stove-pipe blank having a tubular edge, a b, and acommon turned edge, a, substantially as and for the purposes set x 5 forth.

7 GEORGE HIPWELL.

Witnesses:

J. I MASON,

E. F. BOUBNE. 

